You might also look at W8JI.com where he has a pair of phased Beverages in a box-like configuration spaced apart by 1/4 wave with the termination halfway across on one end and fed halfway across the other end.
Herb, KV4FZ On Wed, Sep 12, 2018 at 7:10 AM Tonno Vahk <[email protected]> wrote: > Thank you Herb! I will look into it! > > 73 > Tonnoi > > On 11 Sep 2018, at 17:06, Herbert Schoenbohm <[email protected]> > wrote: > > Tonno, I would suggest getting a DX-Engineering NCC-1 or NCC-2 to do the > phasing for you in your ham shack. That way you will have phasing control > right at your fingertips. > > Herb Schoenbohm, KV4FZ > > On Tue, Sep 11, 2018 at 9:01 AM Tonno Vahk <[email protected]> wrote: > >> Hi, >> >> Last weekend I finally got into experimenting with phased beverages, >> something I was planning for some time. >> >> I installed 3 broadside 219m (718ft) long beverages into the forest >> looking at 90 degrees and separated 60m (200ft) from each other (120m >> between the outer ones). >> >> I took great care to make sure the wires are straight and fully parallel >> to each other as well as starting from the the same line. >> >> I use DXE 9:1 beverage transformers and DXE 470 ohm termination resistors. >> >> I brought 150m (500ft) 50 ohm cable from each beverage feedpoint to the >> shack and connected to Microham Stack Switch (like Stackmatch). All the >> cables were of identical length to ensure same phasing. >> >> So I presume this system gives me full ability to test any combination of >> those 3 beverages alone or phased with each other? >> >> Well, all the 3 beverages alone are quite identical indeed which is good. >> >> But now when switched in pairs or all 3 together I am not seeing much >> effect. I do know what the patterns should look like and I presumed the >> effect would be strong especially with signals coming from side but most of >> the time I notice no difference with any signals when comparing any single >> beverages to combinations. >> >> This is puzzling. Modelling suggests I should for example have very big >> improvements in suppressing signals 45 degrees off on 160m when using 2 >> phased beverages 120m apart as well as when using all 3 beverages on 80m >> but I did not notice such drops of 10-20db almost in any signals from any >> off directions. >> >> I could hardly notice sometimes the expected 3-5db increase in the >> signals from the right direction but not always as well. >> >> Can some of you having experiences with phased beverages tell me if I >> have done something wrong in my setup?? Should I test them differently? Are >> the phased beverages overrated and in real life there is seldom a >> significant improvement over 1 single wire beverage that is already long >> enough like 220m in my case? >> >> Look forward to any input. I can send the modelled patterns and maps of >> my beverages in picture files to anyone interested. >> >> 73 >> Tonno >> ES5TV >> _______________________________________________ >> >> >> >> _______________________________________________ >> TowerTalk mailing list >> [email protected] >> http://lists.contesting.com/mailman/listinfo/towertalk >> > > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
